<template>
    <transition name="slide">
        <div class="user-center">
            <div class="back" @click="back">
                <i class="icon-back"></i>
            </div>
            <div class="switches-wrapper">
                <switches @switch="switchItem" :switches="switches" :currentIndex="currentIndex"></switches>
            </div>
            <div ref="playBtn" class="play-btn" @click="random">
                <i class="icon-play"></i>
                <span class="text">随机播放全部</span>
            </div>
            <div class="list-wrapper" ref="listWrapper">
                <scroll ref="favoriteList" class="list-scroll" v-if="currentIndex===0" :data="favoriteList">
                    <div class="list-inner">
                        <song-list :songs="favoriteList" @select="selectSong"></song-list>
                    </div>
                </scroll>
                <scroll ref="playList" class="list-scroll" v-if="currentIndex===1" :data="playHistory">
                    <div class="list-inner">
                        <song-list :songs="playHistory" @select="selectSong"></song-list>
                    </div>
                </scroll>
            </div>
            <div class="no-result-wrapper" v-if="noResult">
                <no-result :title="noResultDesc"></no-result>
            </div>
        </div>
    </transition>
</template>

<script>
import Switches from '@/baseComponents/switches/switches'
import Scroll from '@/baseComponents/scroll/scroll'
import SongList from '@/baseComponents/song-list/song-list'
import NoResult from '@/baseComponents/no-result/no-result'
import {mapGetters, mapActions} from 'vuex'
import Song from '@/common/js/song'
import {playlistMixin} from '@/common/js/mixin'

export default {
    mixins:[playlistMixin],
    components: {
        Switches,
        Scroll,
        SongList,
        NoResult
    },
    computed: {
        noResult() {
           if(this.currentIndex === 0) {
               return !this.favoriteList.length
           }else{
               return !this.playHistory.length
           }
        },
        noResultDesc() {
           if(this.currentIndex === 0) {
               return '暂无收藏歌曲'
           }else{
               return '你还没有听过歌曲'
           }
        },
        ...mapGetters([
            'favoriteList',
            'playHistory'
        ])
    },
    data() {
        return {
            currentIndex: 0,
            switches: [
                {name: '我喜欢的'},
                {name: '最近听的'}
            ]
        }
    },
    methods: {
        handlePlaylist(playlist){
            const bottom = playlist.length > 0 ? '60px' : ''
            this.$refs.listWrapper.style.bottom = bottom
            //判断列表DOM存在后再执行refresh
            this.$refs.favoriteList && this.$refs.favoriteList.refresh()
            this.$refs.playList && this.$refs.playList.refresh()
        },
        switchItem(index) {
            this.currentIndex = index
        },
        back(){
            this.$router.back() //回退到上一级路由
        },
        selectSong(song) {
            this.insertSong(new Song(song))
        },
        random(){
            let list = this.currentIndex === 0 ? this.favoriteList : this.playHistory
            if(list.length === 0) {
                return
            }
            //这时list还不是实例，需要遍历list进行实例化
            list = list.map((song) => {
               return new Song(song)
            })
            this.randomPlay({
                list
            })
        },
        ...mapActions([
            'insertSong',
            'randomPlay'
        ])
    }
}
</script>

<style lang="stylus" scoped>
  @import "../../common/stylus/variable"

  .user-center
    position: fixed
    top: 0
    bottom: 0
    z-index: 100
    width: 100%
    background: $color-background
    &.slide-enter-active, &.slide-leave-active
      transition: all 0.3s
    &.slide-enter, &.slide-leave-to
      transform: translate3d(100%, 0, 0)
    .back
      position absolute
      top: 0
      left: 6px
      z-index: 50
      .icon-back
        display: block
        padding: 10px
        font-size: $font-size-large-x
        color: $color-theme
    .switches-wrapper
      margin: 10px 0 30px 0
    .play-btn
      box-sizing: border-box
      width: 135px
      padding: 7px 0
      margin: 0 auto
      text-align: center
      border: 1px solid  $color-text-l
      color: $color-text-l
      border-radius: 100px
      font-size: 0
      .icon-play
        display: inline-block
        vertical-align: middle
        margin-right: 6px
        font-size: $font-size-medium-x
      .text
        display: inline-block
        vertical-align: middle
        font-size: $font-size-small
    .list-wrapper
      position: absolute
      top: 110px
      bottom: 0
      width: 100%
      .list-scroll
        height: 100%
        overflow: hidden
        .list-inner
          padding: 20px 30px
    .no-result-wrapper
      position: absolute
      width: 100%
      top: 50%
      transform: translateY(-50%)
</style>


